package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/**
 * @Description: 文件上传和下载
 * @ClassName: CommonController
 * @Author: xmc
 * @Date: 2022/8/17 6:52
 * @Version: 1.0
 */
@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {

    @Value("${reggie.path}")
    private String basePath ;

    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){

        log.info("接收的文件,{}",file);
        log.info(basePath);
        //使用UUID重新生成文件名，避免重复导致覆盖
        String originalFilename = file.getOriginalFilename();
        String suf = originalFilename.substring(originalFilename.lastIndexOf("."));
        String fileName = UUID.randomUUID().toString() + suf;
        //创建一个目录对象
        File dir = new File(basePath);
        // 判断当前目录是否存在
        if(!dir.exists()){
            //不存在，创建一个
            dir.mkdirs();
        }
        try {
            //将文件转存到指定路径
            file.transferTo(new File(basePath +fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
            ServletOutputStream outputStream = response.getOutputStream();
            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            fileInputStream.close();
            outputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
